where is sensible heating and is latent heating. The quantity was named by
Harald Sverdrupafter Ira Sprague Bowen(1898–1973), an astrophysicist whose theoretical work on evaporation to air from water bodies made first use of it, and it is used most commonly in meteorologyand hydrology. In this context, when the magnitude of is less than one, a greater proportion of the available energy at the surface is passed to the atmosphere as latent heat than as sensible heat, and the converse is true for values of greater than one. As , however, becomes unbounded making the Bowen ratio a poor choice of variable for use in formulae, especially for arid surfaces. For this reason the evaporative fractionis sometimes a more appropriate choice of variable representing the relative contributions of the turbulent energy fluxes to the surface energy budget.
The Bowen ratio is related to the evaporative fraction, , through the equation,
* Bowen, I.S., 1926: The ratio of heat losses by conduction and by evaporation from any water surface. Physics Review, 27, pp 779—787.
* Lewis, J.M., 1995: The Story behind the Bowen Ratio. Bulletin of the American Meteorological Society, 76, pp 2433-2443. [http://ams.allenpress.com/amsonline/?request=get-abstract&issn=1520-0477&volume=076&issue=12&page=2433]
* [http://www.nsdl.arm.gov/Library/glossary.shtml#bowen_ratio National Science Digital Library - Bowen Ratio]
* [http://ams.allenpress.com/amsonline/?request=get-abstract&issn=1520-0477&volume=076&issue=12&page=2433 The Story behind the Bowen Ratio]
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